#include <iostream>
using namespace std;
int main()
{
  cout << "THIS IS A PARTIAL FRACTION DECOMPOSITION CALCULATOR\n";
  cout << "Enter the number of ax + b and ax^2 + bx + c factors. Ensure that the factors are integers.\n";
  do
  {
    int factor_1;
    cout << "Enter the number of (ax + b)^n factors:";
    cin >> factor_1;
    int loop_1 = 1;
    if (cin.fail())
    {
      cout << "You did not enter a whole number. Please try again!\n";
    }
    else if(factor_1<0)
    {
      cout << "The number of (ax + b)^n factors cannot be less than 0. Please try again!\n";
    }
    else if(factor_1==0)
    {
      int factor_2;
      cout << "Enter the number of (ax^2 + bx + c)^n factors:";
      cin >> factor_2;
      int loop_2 = 1;
      while (loop_2 <= factor_2)
      {
        int exponent_2;
        cout << "Enter the exponent 'n' in " << loop_2 << ". (ax^2 + bx + c)^n:";
        cin >> exponent_2;
        if (cin.fail())
        {
          cout << "You did not enter a whole number. Please try again!";
        }
        else if (exponent_2<0)
        {
          cout << "The exponent of " << loop_2 << ". (ax^2 + bx + c)^n cannot be less than 0.\n";
        }
        else
        {
          int coefficient_2a;
          cout << "Enter the coefficient 'a' in " << loop_2 << ". (ax^2 + bx + c)^n:";
          cin >> coefficient_2a;
          if (cin.fail())
          {
            cout << "You did not enter a whole number. Please try again!";
          }
          else
          {
            int coefficient_2b;
            cout << "Enter the coefficient 'b' in " << loop_2 << ". (ax^2 + bx + c)^n:";
            cin >> coefficient_2b;
            if (cin.fail())
            {
              cout << "You did not enter a whole number. Please try again!";
            }
            else
            {
              int constant_2;
              cout << "Enter the constant 'c' in " << loop_2 << ". (ax^2 + bx + c)^n:";
              cin >> constant_2;
              if (cin.fail())
              {
                cout << "You did not enter a whole number. Please try again!";
              }
              else
              {
                cout << "Your " << loop_2 << ".(ax^2 + bx + c)^n factor is " << "(" << coefficient_2a << "x^2" << " + " << coefficient_2b << "x" << " + " << constant_2 << ")^" << exponent_2 << "\n";
                loop_2 += 1;
              }
            }    
          }        
        }            
      }
    }
    else
    {
      while (loop_1 <= factor_1)
      {
        int exponent_1;
        cout << "Enter the exponent 'n' in " << loop_1 << ". (ax + b)^n:";
        cin >> exponent_1;
        if (cin.fail())
        {
          cout << "You did not enter a whole number. Please try again!";
        }
        else if (exponent_1<0)
        {
          cout << "The exponent of " << loop_1 << ". (ax + b)^n cannot be less than 0.\n";
        }
        else
        {
          int coefficient_1;
          cout << "Enter the coefficient 'a' in " << loop_1 << ". (ax + b)^n:";
          cin >> coefficient_1;
          if (cin.fail())
          {
            cout << "You did not enter a whole number. Please try again!";
          }
          else
          {
            int constant_1;
            cout << "Enter the constant 'b' in " << loop_1 << ". (ax + b)^n:";
            cin >> constant_1;
            if (cin.fail())
            {
              cout << "You did not enter a whole number. Please try again!";
            }
            else
            {
              cout << "Your " << loop_1 << ".(ax + b)^n factor is " << "(" << coefficient_1 << "x" << " + " << constant_1 << ")^" << exponent_1 << "\n";
              loop_1 += 1;
            }
          }
        }
      }
      int factor_2;
      cout << "Enter the number of (ax^2 + bx + c)^n factors:";
      cin >> factor_2;
      int loop_2 = 1;
      while (loop_2 <= factor_2)
      {
        int exponent_2;
        cout << "Enter the exponent 'n' in " << loop_2 << ". (ax^2 + bx + c)^n:";
        cin >> exponent_2;
        if (cin.fail())
        {
          cout << "You did not enter a whole number. Please try again!";
        }
        else if (exponent_2<0)
        {
          cout << "The exponent of " << loop_2 << ". (ax^2 + bx + c)^n cannot be less than 0.\n";
        }
        else
        {
          int coefficient_2a;
          cout << "Enter the coefficient 'a' in " << loop_2 << ". (ax^2 + bx + c)^n:";
          cin >> coefficient_2a;
          if (cin.fail())
          {
            cout << "You did not enter a whole number. Please try again!";
          }
          else
          {
            int coefficient_2b;
            cout << "Enter the coefficient 'b' in " << loop_2 << ". (ax^2 + bx + c)^n:";
            cin >> coefficient_2b;
            if (cin.fail())
            {
              cout << "You did not enter a whole number. Please try again!";
            }
            else
            {
              int constant_2;
              cout << "Enter the constant 'c' in " << loop_2 << ". (ax^2 + bx + c)^n:";
              cin >> constant_2;
              if (cin.fail())
              {
                cout << "You did not enter a whole number. Please try again!";
              }
              else
              {
                cout << "Your " << loop_2 << ".(ax^2 + bx + c)^n factor is " << "(" << coefficient_2a << "x^2" << " + " << coefficient_2b << "x" << " + " << constant_2 << ")^" << exponent_2 << "\n";
                loop_2 += 1;
              }
            }    
          }        
        }            
      }
    }
  }
  while(!cin.fail());
  return 0;
} 

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
} 

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
} 

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}  

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition); 

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}